Fix loading status in 2 progress bars

Increment tiles_done in clearInvalidHouseTiles and
clearModifiedTileState.
Fix pos_retries bug

This commit also removes an unnecessary check
Fix potential null pointer dereferencing

SendNode assumes that the node pointer passed to it isn't nullptr, and
createLeaf can return nullptr, so this commit prevents the map editor
from crashing if that happens.
Virtual deconstructor for ActionQueue

ActionQueue is being inherited inherited from NetworkActionQueue, so the
deconstructor of ActionQueue should be declared virtual to make sure all
deconstructors that should be called are called.
Fix wrong use of std::remove and std::unique

std::remove(begin, end, value) and std::unique don't actually erase
anything, they return a new iterator which is meant to be the new end,
and everything between that and the actual end should be erased.
Fix wrong use of std::shared_ptr

Memory allocated with new[] should be free'd using delete[], the default
behavior of shared ptr is to free memory using delete.
Small optimization

n - amount > 0 for unsigned values should be the same as n != amount
Fix screenshot path bug
Remove unused variables
Return null instead of false, OnAcceptConnection

The function returns a pointer, not a boolean.
Remove redundant if-statement
Merge pull request #3 from marksamman/master

Fix a lot of issues, and some cleanup
added missing data (is possible add more versions 98x)
update items
Merge pull request #5 from mattyx14/master

added missing data (possible to add more versions 98x)
Add CMake to compile for linux

* Fixes to compile with wxWidgets 3.0
* Fixes to compile in linux 64 bits
* Update linux instructions in README
* Remove source/Makefile
Merge pull request #6 from edubart/master

Add CMake to compile for linux
Lots of changes

Removed libxml2 to use pugixml.
Fixed a bug with the progress bar.
Changed some things in most xml files that pugixml did not like.
Updated the Visual Studio project.
Any NULL symbol has been changed to nullptr.
This most probably broke the CMake that was recently added.
And probably some other things.
Remove DLL.
Lets not use the .otgz format yet.