Merge Suckless Updates, Refactor Config.h and Enhance dwm Performance

[fesowowako]

Suckless Updates: Integrate latest dwm updates from the Suckless project.
Config.h Refactor: Improve readability of config.h, resolving past formatting issues.
In the dwm.c modification, I swapped the fork() and execvp() code for posix_spawnp(). This change enhances efficiency by minimising system calls, which speeds up process creation. posix_spawnp() also offers finer control over the new process, such as setting attributes, optimising its performance.

[narukeh]

This seems pretty nice. As for the formating, i have added this:
/* vim:set ts=8 sw=8: */
at the top of the file, then "long-cells-in-coulums" look better, though not always :D

Could you, mayhaps, implement #222?

[fesowowako]

In the latest config.mk update, I've upgraded the version to 6.5 and introduced an optional optimisations flag for those who wish to utilise them. Additionally, I've included the -Wno-unused-function flag in the CFLAGS, which suppresses warnings about unused functions, thereby removing dead code.

[fesowowako]

This seems pretty nice. As for the formating, i have added this: /* vim:set ts=8 sw=8: */ at the top of the file, then "long-cells-in-coulums" look better, though not always :D

Could you, mayhaps, implement #222?

I will investigate it and aim to implement it within the next three weeks, though I am quite busy at the moment.