Continuous Release

• Added in ability for plugin_manager to sort and filter plugins easily. (Thank you "Big T" @takase1121!)
• Added in ability to detect when ppm is being run not from a console on Windows, and added a pause mechanism.
• Support symbolic links in windows.
• Added in internal hashing mechanism, as libgit no longer provides, and mbedtls doesn't either.
• Added in significant amount of new swtiches to modify what's included in an ppm build, full list in build.sh.
• Allowed for unzipping of .gz when not .tar.gz.
• Fixed errors when handling chunked transfer encoding.
• Changed way that we construct bottles, so that we don't do as much copying. Will still copy executables in the case where it would not function if we symlinked.
• Properly symlink folders when --symlink specified; we symlink folder contents, not the folder itself, so we no longer pollute source folders.
• Added in the ability to create named bottles.
• Changed behaviour of switch to simply deal with ppm defaults, rather than changing anything about the system itself.
• Added the distinction of a primary bottle (i.e. the one we've switched to), and the system bottle (i.e. the one that has a userdir at ~/.config/pragtical and is on the path).
• Changed default location of CACHEDIR from USERDIR/ppm to ~/.cache/ppm. Which means that across many different user directories, we will keep a proper cache.
• Changed the way we run bottles; we now specify PRAGTICAL_USERDIR as an environment variable, rather than creating a user directory.