[Lazarus] TLMMouseEvent now lacks "state"

[Felipe Monteiro de Carvalho]

It is also relevant to note that it is rather messy like it is now,
with 2 versions of TreeView in the Lazarus-CCR being that the newer
one depends on an external package ... the external package should be
moved to the CCR or copied there for private use of the
VirtualTreeView, and the older one removed.

-- 
Felipe Monteiro de Carvalho