build: Added AUR/ArchLinux support (#566)

* store version in file

* use version file in release workflow

* use new version file in build workflow

* ArchLinux build

* setup cache for ArchLinux

* add version check in release CI

* edit step description

* update pkgbuild to install correctly

* AUR deploy

* rename version file to VERSION

* install all default plugins in PKGBUILD

* Added emojis to build workflow

* Added emojis to release workflow

* separate update packages and install dependencies in two steps

* fix Release CI

* add md5Sums to PKGBUILD

* make PKGBUILD point to the official repo + set v in tag

cmake/build_helpers.cmake

@@ -228,8 +228,6 @@ macro(createPackage)
         downloadImHexPatternsFiles("./share/imhex")
     endif()
     
-    write_file(version ${PROJECT_VERSION})
-
     if (CREATE_BUNDLE)
         include(PostprocessBundle)