fix template & objects with custom collider rotations defined do not work appropriately

[eonarheim]

This PR covers 2 problems

1. Tiles with custom collider rotations were not respected previously, this is fixed by actually applying the rotation to the point transformation. Tested on all polygon types Boxes and Polygons

     <tile id="117">
       <objectgroup draworder="index" id="2">
        <object id="1" x="0.181818" y="4.18182" rotation="88">
         <polygon points="0,0 2.09091,-2.36364 7.63636,-2.45455 9.81818,0.454545 14.3636,0.545455 15.5455,1.63636 15.9091,8.81818 14.7273,9.72727 1.90909,9.63636 -0.0909091,7.54545"/>
        </object>
        <object id="6" x="-0.272727" y="0.363636" width="3.81818" height="2.72727" rotation="31"/>
       </objectgroup>
     </tile>

2. Objects using templates also did not work properly with custom colliders when flipped horizontally/vertically. Note the presence of gid on the template object, this was previously unhandled by the plugin and confused the parser.

     <object id="2" template="coin.tx" gid="3221225698" x="47.75" y="80" rotation="179" visible="1"/>