Add CMakeLists for panda/recorder.
Add CMakeLists for panda/collide.
Add CMakeLists.txt for panda/framework.
Remove (filename)_src.c includes from panda/text CMakeLists. These files are included in other .cxx files.
Remove extra '}' from panda/mathutil/CMakeLists.txt that was causing linking errors.
Cleanup some dtool/package.cmake find variables.
Remove unnecessary link target from panda/downloader/CMakeLists
Add CMakeLists.txt to pview, such that it will compile (but it does not link).