sxwm v1.7 release

In the conquest for beauty, the modern man finds only ornament, losing the grace of simplicity.

changelog

update(docs): voidlinux installation by @Rooyca in https://github.com/uint23/sxwm/pull/94
Refactor keybinding configuration and parsing logic by @elbachir-one in https://github.com/uint23/sxwm/pull/110
Feature: Custom gaps on each side by @pbadeer in https://github.com/uint23/sxwm/pull/155
Update/Polish README by @97rns in https://github.com/uint23/sxwm/pull/222
merge: allow custom layouts + other changes vvv by @uint23 in https://github.com/uint23/sxwm/pull/225
merge: fix undefined behavior & add xcursor package to void dep list by @uint23 in https://github.com/uint23/sxwm/pull/226
Fix errx eval values by @dehroox in https://github.com/uint23/sxwm/pull/227
Setting and resetting opacity based on window fullscreen state by @l0wigh in https://github.com/uint23/sxwm/pull/209
Small miscellaneous revisions/refactors by @dehroox in https://github.com/uint23/sxwm/pull/229
mirror layout option by @palsmo in https://github.com/uint23/sxwm/pull/231
Termux Build instructions and Makefile addition by @Welpyes in https://github.com/uint23/sxwm/pull/235
Fix Window swallowing to target the parent window and not any swallower by @l0wigh in https://github.com/uint23/sxwm/pull/232

@Rooyca made their first contribution in https://github.com/uint23/sxwm/pull/94
@97rns made their first contribution in https://github.com/uint23/sxwm/pull/222
@uint23 made their first contribution in https://github.com/uint23/sxwm/pull/225
@l0wigh made their first contribution in https://github.com/uint23/sxwm/pull/209
@palsmo made their first contribution in https://github.com/uint23/sxwm/pull/231
@Welpyes made their first contribution in https://github.com/uint23/sxwm/pull/235

full changelog: https://github.com/uint23/sxwm/compare/v1.6...v1.7