Found and fixed duplicate method definitions for the same API

[lgoldstein]

• Added duplicate method detection tests for Kernel32, Advapi32 and User32 as they contain most of the low-level API(s) (welcome to add more...) - this is how the issues were discovered and fixed

Kernel32:

• Removed duplicate GetDiskFreeSpaceEx - preserved the one with LARGE_INTEGER definition as it matches the API definition
• Added GetDiskFreeSpace API
• Removed duplicate ReadFile - left and modified the remaining one to use byte[] argument in order to match the WriteFile definition
• Removed duplicate FormatMessage - kept the one with PointerByReference since it is the definition that closest matches the API (+ it is the only one used in the current code)

User32:

• Removed duplicate SetWindowLong - kept the one with the int(s) as it matches the API definition
• Removed duplicate CallNextHookEx - kept the one with LPARAM as it matches the API definition

Please note that the "changes" seem more than that but this is misleading - my IDE (Eclipse) is set up so that on "Save" it trims trailing white spaces in the source lines, replaces TAB(s) with 4 spaces, removes unused imports and adds missing @OverRide(s). I think this is recommended behavior, but do let me know if you disagree and I will configure it otherwise.

[dblock]

There's a compile error in a contrib directory that looks legit:

compile:
    [mkdir] Created dir: /Users/travis/build/twall/jna/contrib/w32keyhook/build/classes
    [javac] Compiling 1 source file to /Users/travis/build/twall/jna/contrib/w32keyhook/build/classes
    [javac] warning: [options] bootstrap class path not set in conjunction with -source 1.5
    [javac] /Users/travis/build/twall/jna/contrib/w32keyhook/com/sun/jna/contrib/demo/KeyHook.java:50: error: method CallNextHookEx in interface User32 cannot be applied to given types;
    [javac]                 return lib.CallNextHookEx(hhk, nCode, wParam, info.getPointer());
    [javac]                           ^
    [javac]   required: HHOOK,int,WPARAM,LPARAM
    [javac]   found: HHOOK,int,WPARAM,Pointer
    [javac]   reason: actual argument Pointer cannot be converted to LPARAM by method invocation conversion
    [javac] 1 error
    [javac] 1 warning

[lgoldstein]

Sorry I missed it - fixed and re-pushed the commit

[lgoldstein]

Took the opportunity to also remove the GetIconInfo overload with the HANDLE.

[dblock]

Check out Travis-CI, didn't dig into the issues, but I am pretty sure this should be passing here.

[lgoldstein]

You are right - I can't explain how, but seems like a bunch of critical import(s) was removed from the file. I restored them and now everything should compile - I don't know how this has happened since I compiled and tested my code before committing...

[lgoldstein]

All checks have passed successfully now

[dblock]

Thanks, merging. Good work.