Implemented Windows build in Ant

The Windows build of HearthStats.exe has now been standardised in an Ant build script, so you can build it without an IDE or configuring any options. If you have Ant, just run the following from the project root:
```
ant build_windows
```

(The OS X version already has an Ant build, you can run that with the build_osx target)
Implemented Windows build in Ant

The Windows build of HearthStats.exe has now been standardised in an Ant build script, so you can build it without an IDE or configuring any options. If you have Ant, just run the following from the project root:
```
ant build_windows
```

(The OS X version already has an Ant build, you can run that with the build_osx target)
Fixed warning message when Hearthstone starts up in Windows

The Windows version of HearthStats.net Uploader was displaying this message when Hearthstone starts up: "Warning! Hearthstone minimized. No detection possible". This was because it takes a moment for Hearthstone to display its window; we now give it a second or two before assuming that it has been minimised.