Remove theme-compiler and replace with external vaadin-sass-compiler
* Moves CompileTheme from the theme-compiler to buildhelpers
* Refactors CompileTheme to get the Vaadin version on the command line
instead of using the Version class found in vaadin-shared
* Refactors build scripts to pass the version number on the command line
when running CompileTheme
* Removes the theme-compiler module/project/whatchamacallit
* Replaces the theme-compiler dependency with vaadin-sass-compiler 0.9.0
from maven
Change-Id: I4f98d15b60e18a826bf264eb55d12b3e736e8e54
Correctly report theme version in the debug window (#11442)
* Adds a special v-vaadin-version selector for detecting the theme version
* The version in the base theme is replaced during build (for releases) and by the current version also when compiling in the IDE
Change-Id: Id6b94ab2edead61602fed021b7152f6e46be809f