Add a function for getting matches, and use it to simplify a lot of code

ale_linters/java/javac.vim

@@ -28,15 +28,8 @@ function! ale_linters#java#javac#Handle(buffer, lines) abort
     let l:pattern = '^.*\:\(\d\+\):\ \(.*\):\(.*\)$'
     let l:output = []
 
-    for l:line in a:lines
-        let l:match = matchlist(l:line, l:pattern)
-
-        if len(l:match) == 0
-            continue
-        endif
-
+    for l:match in ale#util#GetMatches(a:lines, l:pattern)
         call add(l:output, {
-        \   'bufnr': a:buffer,
         \   'lnum': l:match[1] + 0,
         \   'text': l:match[2] . ':' . l:match[3],
         \   'type': l:match[2] ==# 'error' ? 'E' : 'W',