Add support for nim check

test/handler/test_nim_handler.vader

@@ -0,0 +1,33 @@
+Execute(Parsing nim errors should work):
+  runtime ale_linters/nim/nimcheck.vim
+
+  AssertEqual
+  \ [
+  \   {
+  \     'bufnr': 42,
+  \     'lnum': 8,
+  \     'col': 8,
+  \     'text': 'Warning: use {.base.} for base methods; baseless methods are deprecated [UseBase]',
+  \     'type': 'W',
+  \   },
+  \   {
+  \     'bufnr': 42,
+  \     'lnum': 12,
+  \     'col': 2,
+  \     'text': 'Error: identifier expected, but found ''a.barfoo''',
+  \     'type': 'E',
+  \   },
+  \   {
+  \     'bufnr': 42,
+  \     'lnum': 2,
+  \     'col': 5,
+  \     'text': 'Hint: ''NotUsed'' is declared but not used [XDeclaredButNotUsed]',
+  \     'type': 'W',
+  \   },
+  \ ],
+  \ ale_linters#nim#nimcheck#Handle(42, [
+  \ 'Line with wrong( format)',
+  \ 'foobar.nim(8, 8) Warning: use {.base.} for base methods; baseless methods are deprecated [UseBase]',
+  \ 'foobar.nim(12, 2) Error: identifier expected, but found ''a.barfoo''',
+  \ '/nested/folder/foobar.nim(2, 5) Hint: ''NotUsed'' is declared but not used [XDeclaredButNotUsed]',
+  \ ])