fix #511 - copyFiles should not overwrite identical files on windows

Fixed issue where static libraries would be generated instead of object files in singleFile build mode ...

+ Added object TargetType that is used during singleFile build mode

Fixed Windows singleFile build mode issues ...

+ Fixed error with long command line when invoking the linker
+ Fixed object file naming

fixup #506 ...

- only use absolute initialCompilerBinary paths
- don't try to find absolute initialCompilerBinary in
  PATH

Fix: dub broken if compiled with absolute path DC ...

Code that was supposed to find working compiler always tried to
build absolute path from compiler name - even it was absolute
path already.

Fix compilation with DMD git HEAD ...

Recently merged cmake generator triggered one warning and one
error when compiled with DMD git HEAD.

Merge pull request #497 from Dicebot/tmpfile ...

Use unique names for temporary files

use a simple UUID based tempfile ...

- there is no function on Windows that guarantee
  uniqueness AND allow to add a custom extension

- we aren't worried about security safe tempfiles
  here, so pseudo-random is good enough

Merge pull request #354 from MartinNowak/fix354 ...

dub build --build=ddox doesn't work on OS X

Use unique filenames for temporary files ...

Partial fix to #482

Use standard tempDir instead of custom implementation

fix Issue #354 - build ddox does not work on OSX ...

- use rsync because cp update is linux specific

Merge pull request #489 from Yoplitein/cmake ...

Add generator for CMake build scripts

build multiple objects in parallel ...

- partly fixes Issue #498

Add warning about required CMake version

Fix build errors on older compilers (again)

Support string import paths

Use Path instead of raw strings

Generate CMakeLists.txt if it does not exist

Fix build errors on older compilers

Add generator for CMake build scripts

fix Issue #487 - Cannot read file sourcemain.d ...

- replace concat of strings with concat of Path

Fix returning address to local from PackageManager.hashPackage(). Fixes #490.

Fix handling of path based dependencies to sub packages. Fixes #448.

Fix the condition to detect manually overridden source/import paths.

Merge pull request #461 from londey/sublimetext ...

Added SublimeText Project Generator

fix Issue 480 - default to available compiler ...

- search PATH for available compilers
- still prefer initialCompilerBinary (the one dub was build with)

use hardlinks for copyFiles

fix Issue 377 - failure to remove package because of build output file ...

- fixed by removing the journal
- tedious to track all the output files
- journal didn't keep track of modified or removed files anyhow

fix Issue 483 - Dub auto adds source/ even when sourcePaths is overiden ...

- check if paths were explicitly specified before filling in defaults

- now also checks for app_main_file in non-default source folders