pothos: deleted development tree from poco
Squashed 'poco/' content from commit 23760af

git-subtree-dir: poco
git-subtree-split: 23760affa815b6529963f55baaeaedd8348d79e3
Merge commit '46215802182f638835a8f8fa2e5e1f9c9ed7cf4b' as 'poco'
Merge branch 'poco_153_release_tag'
pothos-library: fix PCH install prefix