Fixed link to libyaml [ci skip]

Signed-off-by: Alberto Corona <albcoron@gmail.com>
Added prelim parser functions
Added preliminary parser functions in parser.h using libyaml. Input needs to be fixed for sprites in entities.h

Signed-off-by: Alberto Corona <albcoron@gmail.com>
Merging commit e79d0bf6a3
Fixed link to libyaml [ci skip]
Merging commit 1e0267cf6b
Added prelim parser functions