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/ex_cmds.h

@@ -21,7 +21,7 @@
 
 // for lnum argument in do_ecmd()
 #define ECMD_LASTL      (linenr_T)0     // use last position in loaded file
-#define ECMD_LAST       ((linenr_T)-1)  // use last position in all files
+#define ECMD_LAST       ((linenr_T) - 1)  // use last position in all files
 #define ECMD_ONE        (linenr_T)1     // use first line
 
 /// Previous :substitute replacement string definition