Implement opt Q for fixed-point precision, and q literals (e.g. 12.34q8) (#958)

Fixes #957

Co-authored-by: ISSOtm <eldredhabert0@gmail.com>

contrib/bash_compl/_rgbasm.bash

@@ -39,6 +39,7 @@ _rgbasm_completions() {
 		[M]="dependfile:glob-*.mk *.d"
 		[o]="output:glob-*.o"
 		[p]="pad-value:unk"
+		[Q]="q-precision:unk"
 		[r]="recursion-depth:unk"
 		[W]="warning:warning"
 	)

contrib/zsh_compl/_rgbasm

@@ -56,6 +56,7 @@ local args=(
 	'*'-MQ"+[Add a target to the rules]:target:_files -g '*.{d,mk,o}'"
 	'(-o --output)'{-o,--output}'+[Output file]:output file:_files'
 	'(-p --pad-value)'{-p,--pad-value}'+[Set padding byte]:padding byte:'
+	'(-Q --q-precision)'{-Q,--q-precision}'+[Set fixed-point precision]:precision:'
 	'(-r --recursion-depth)'{-r,--recursion-depth}'+[Set maximum recursion depth]:depth:'
 	'(-W --warning)'{-W,--warning}'+[Toggle warning flags]:warning flag:_rgbasm_warnings'