Rework the build system (#19)

* Added simple configure script

Added simple script to autodetect if optional dependencies are installed
and enable/disable them as needed. Note this solution uses the compiler
directly instead of an external program like pkgconfig so it doesn't
require any extra dependencies. It is intended to work with any
arbitrary compiler; it has been tested with tcc and gcc.

There are some "breaking" changes hidden here
- HAVE_GIFLIB was renamed to HAVE_LIBGIF to match HAVE_LIBEXIF
- Simply typing `make` will no longer try to build with optional
  dependencies

* use implicit RM variable

* General clean-up in configure

- Use printf instead of echo
- Format style

* honor env PREFIX, use LDLIBS

* Revert "General clean-up in configure"

This reverts commit 8683c179dbf273a330f9a224a4d481a7bea42c5f.

* honor env LDFLAGS if set

* Don't set OPTIONAL_LIBS in configure

* make OBJ all caps

* follow suckless style build system

- remove configure script.
- HAVE_LIBGIF and HAVE_LIBEXIF defaults back to 1
- unload several varibales onto config.mk
- make version all-caps
- add -O2 optimization
- use CPPFLAGS for includes and defines

* Revert "follow suckless style build system"

This reverts commit 8bf75b1f68d72df349edba8d998d4659dd956dd8.

* Generate config.mk from make

* Inlined configure in Makefile

* update docs

* cleanups

- changes to config.mk should trigger a rebuild
- remove potentially confusing variables form Makefile

* Use install instead of mkdir/cp/chmod when sensible

* fixup! Inlined configure in Makefile

* Don't generate config.mk on rm -f *.o sxiv

* update docs and cleanups

- make config.mk silent
- mention editing config.mk in README

* fallback to 0 if user edits config.mk in unexpected way

* add comment on config.mk

* remove invalid comment

configure script is removed

* slight restructure

- make version all caps
- restructure variables that users may want to edit to top
- use CPPFLAGS for defines
- add some comments
- remove needless echos since we have verbose output now

* add echos back

Co-authored-by: NRK <nrk@disroot.org>
Co-authored-by: Berke Kocaoğlu <berke.kocaoglu@metu.edu.tr>

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