Remove boost headers and libs.

Remove support for 32-Bit boost on Windows.
Install boost in the build_libs.sh script.
Update Readme.md.
Clone boost with 32 Threads.
Cache boost folder in the CI.
Remove support for msvc.
Close #51
1 job for feature/boost_as_git in 5 minutes and 36 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
failed #475610
build

00:05:36

 
Name Stage Failure
failed
build Build There is an unknown failure, please try again
 #include "boost/coroutine2/all.hpp"
^~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
Makefile.Release:5073: recipe for target 'release/controlitem.o' failed
make[1]: *** [release/controlitem.o] Error 1
make[1]: Leaving directory '/builds/leander.schulten/Lichtsteuerung/build'
Makefile:38: recipe for target 'release' failed
make: *** [release] Error 2
ERROR: Job failed: exit code 1