Finalize translation of pl.lua

Backed out changeset 575c0de98505 Reason: We suspect that this patch might break Windows builds and render the mouse on Windows unusable. This suspicion is based on the bug report of one user: https://hedgewars.org/node/6837#comment-33593 In return, this changeset will definitely re-introduce bug #512.

Fix grammar fail in cosmos.lua (string freeze compliant) This is string freeze compliant because the new string is already contained in stub.lua.

Update pl.lua (>99% complete) A few strings have been removed because of empty translations of faulty format strings.

animation tweak

Fix incorrect check for cake gear type in ClimbHome

remove some more test redundancy and restore a missing and important nil check

just merging if statements

- Update .pro file - Rethink logic of TCPBase, fixes bug with failing to receive all bytes from engine when process end signal is received before tcp disconnect

Remove unused uCommands from uGearsHandlersMess