refactor(uncrustify): change rules to better align with the style guide

Add space around arithmetic operators '+' and '-'.
Remove space between back-to-back parentheses, i.e. ')(' vs. ') ('.
Remove space between '((' or '))' of control statements.
Add space between ')' and '{' of control statements.
Remove space between function name and '(' on function declaration.
Collapse empty blocks between '{' and '}'.
Remove newline at the end of the file.
Remove newline between 'enum' and '{'.
Remove newline between '}' and ')' in a function invocation.
Remove newline between '}' and 'while' of 'do' statement.

src/nvim/lua/converter.c

@@ -1236,7 +1236,7 @@ LuaRef nlua_pop_LuaRef(lua_State *const lstate, Error *err)
     type ret; \
     if (lua_type(lstate, -1) != LUA_TNUMBER) { \
       api_set_error(err, kErrorTypeValidation, "Expected Lua number"); \
-      ret = (type)-1; \
+      ret = (type) - 1; \
     } else { \
       ret = (type)lua_tonumber(lstate, -1); \
     } \