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Remove terminalapp plugin and fold its implementation in to lib/termsupport.zsh. Replaces the redundant Terminal.app support that was recently added to termsupport.

Using the chpwd hook function causes some junk to be printed to STDOUT after
returning from a subshell wherein the working directory was changed. In rare
cases, this can cause issues with 3rd party tools. An example is this issue
with the Python virtualenvwrapper tool:

https://bitbucket.org/dhellmann/virtualenvwrapper/issue/216/lsvirtualenv-and-workon-output-broken-in