Issue due date (#3794)

* Started adding deadline to ui

* Implemented basic issue due date managing

* Improved UI for due date managing

* Added at least write access to the repo in order to modify issue due dates

* Ui improvements

* Added issue comments creation when adding/modifying/removing a due date

* Show due date in issue list

* Added api support for issue due dates

* Fixed lint suggestions

* Added deadline to sdk

* Updated css

* Added support for adding/modifiying deadlines for pull requests via api

* Fixed comments not created when updating or removing a deadline

* update sdk (will do properly once go-gitea/go-sdk#103 is merged)

* enhanced updateIssueDeadline

* Removed unnessecary Issue.DeadlineString

* UI improvements

* Small improvments to comment creation
+ ui & validation improvements

* Check if an issue is overdue is now a seperate function

* Updated go-sdk with govendor as it was merged

* Simplified isOverdue method

* removed unessecary deadline to 0 set

* Update swagger definitions

* Added missing return

* Added an explanary comment

* Improved updateIssueDeadline method so it'll only update `deadline_unix`

* Small changes and improvements
* no need to explicitly load the issue when updating a deadline, just use whats already there
* small optimisations

* Added check if a deadline was modified before updating it

* Moved comment creating logic into its own function

* Code cleanup for creating deadline comment

* locale improvement

* When modifying a deadline, the old deadline is saved with the comment

* small improvments to xorm session handling when updating an issue deadline
+ style nitpicks

* style nitpicks

* Moved checking for if the user has write acces to middleware

1 files changed, 25 insertions, 13 deletions

diff --git a/vendor/code.gitea.io/sdk/gitea/pull.go b/vendor/code.gitea.io/sdk/gitea/pull.go
index ee3fe116de..7d38b14d7d 100644
--- a/vendor/code.gitea.io/sdk/gitea/pull.go
+++ b/vendor/code.gitea.io/sdk/gitea/pull.go
@@ -22,6 +22,7 @@ type PullRequest struct {
 	Labels    []*Label   `json:"labels"`
 	Milestone *Milestone `json:"milestone"`
 	Assignee  *User      `json:"assignee"`
+	Assignees []*User    `json:"assignees"`
 	State     StateType  `json:"state"`
 	Comments  int        `json:"comments"`
 
@@ -41,9 +42,14 @@ type PullRequest struct {
 	MergeBase string        `json:"merge_base"`
 
 	// swagger:strfmt date-time
+	Deadline *time.Time `json:"due_date"`
+
+	// swagger:strfmt date-time
 	Created *time.Time `json:"created_at"`
 	// swagger:strfmt date-time
 	Updated *time.Time `json:"updated_at"`
+	// swagger:strfmt date-time
+	Closed *time.Time `json:"closed_at"`
 }
 
 // PRBranchInfo information about a branch
@@ -79,13 +85,16 @@ func (c *Client) GetPullRequest(owner, repo string, index int64) (*PullRequest,
 
 // CreatePullRequestOption options when creating a pull request
 type CreatePullRequestOption struct {
-	Head      string  `json:"head" binding:"Required"`
-	Base      string  `json:"base" binding:"Required"`
-	Title     string  `json:"title" binding:"Required"`
-	Body      string  `json:"body"`
-	Assignee  string  `json:"assignee"`
-	Milestone int64   `json:"milestone"`
-	Labels    []int64 `json:"labels"`
+	Head      string     `json:"head" binding:"Required"`
+	Base      string     `json:"base" binding:"Required"`
+	Title     string     `json:"title" binding:"Required"`
+	Body      string     `json:"body"`
+	Assignee  string     `json:"assignee"`
+	Assignees []string   `json:"assignees"`
+	Milestone int64      `json:"milestone"`
+	Labels    []int64    `json:"labels"`
+	// swagger:strfmt date-time
+	Deadline  *time.Time `json:"due_date"`
 }
 
 // CreatePullRequest create pull request with options
@@ -101,12 +110,15 @@ func (c *Client) CreatePullRequest(owner, repo string, opt CreatePullRequestOpti
 
 // EditPullRequestOption options when modify pull request
 type EditPullRequestOption struct {
-	Title     string  `json:"title"`
-	Body      string  `json:"body"`
-	Assignee  string  `json:"assignee"`
-	Milestone int64   `json:"milestone"`
-	Labels    []int64 `json:"labels"`
-	State     *string `json:"state"`
+	Title     string     `json:"title"`
+	Body      string     `json:"body"`
+	Assignee  string     `json:"assignee"`
+	Assignees []string   `json:"assignees"`
+	Milestone int64      `json:"milestone"`
+	Labels    []int64    `json:"labels"`
+	State     *string    `json:"state"`
+	// swagger:strfmt date-time
+	Deadline  *time.Time `json:"due_date"`
 }
 
 // EditPullRequest modify pull request with PR id and options