For @-directives, infer missing semicolon before closing brace (#12792)

Parser now accepts the following (note missing semicolon after last
@extend-directive): 

xyzzy {
  @extend foo ;
  @extend bar
}

As a consequence, moved 31 sasslang-cases from broken to fixed. Moved
two tests from fixed to broken (34, 95, previously passed accidentally)

Change-Id: I8968074abd79dec71be762ed926cc6f37fbcaa99
Merge commit '37919d14b7509b1c8d8495a3e334d50a913bfe6f' into master

Conflicts:
	theme-compiler/src/com/vaadin/sass/internal/parser/Parser.java

Change-Id: I9e169d9c04998f9e7dc05953d51cd76348dd810c