Lua.yaml: Add Lua language

Add language definition for Lua

Add Lua delimiters

Fix wrong details in Lua nested block comment delimiter

Improve formatting

Make values as strings

Correct ending delimiter in nested_block_comment_lua.yaml

Remove keywords already specified in datatypes

data/Delimiter/double_hyphen.yaml

@@ -0,0 +1,3 @@
+type: comment
+start: '--'
+end: '--'

data/Delimiter/double_hyphen_double_brackets.yaml

@@ -0,0 +1,3 @@
+type: comment
+start: '--[['
+end: ']]'

data/Delimiter/nested_block_comment_lua.yaml

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+type: comment
+# Different number of = symbols provides nesting
+start: '--[===['
+end: ']===]'

data/Language/Lua.yaml

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+identifier: Lua
+creation_date: 1993
+full_name: Lua
+wikidata: Q207316
+grammar_file: https://github.com/antlr/grammars-v4/blob/master/lua/Lua.g4
+extensions:
+  - lua
+delimiters:
+  # comment delimiters
+  - double_hyphen
+  - double_hyphen_double_brackets
+  - nested_block_comment_lua
+  # string delimiters
+  - double_quote_slash_escape
+  - single_quote_slash_escape
+datatypes:
+  - bool_lower_case
+  - string          # TODO
+  - number          # TODO
+  - function        # TODO
+  - nil             # TODO
+keywords:
+  - and
+  - break
+  - do
+  - else
+  - elseif
+  - end
+  - for
+  - if
+  - in
+  - local
+  - not
+  - or
+  - repeat
+  - return
+  - then
+  - until
+  - while