Build improvements (#51)

* Build: Add symbols to 7z archive

It is much smaller than ZIP (15MB vs 34MB).

* Build: Don't create source package

There is no need to create package with sources as sources for given
release can be easily obtained from git.

* AppVeyor: Remove unneeded install script

__MakeFinal.bat now handles it.

* Build: Less verbose output

* Build: Support for version suffix

AppVeyor may add suffix to version (X.Y.Z-abc) in case of PR builds.

* AppVeyor: Disable shallow clone

To be able to use git commands (in source indexing script).
Use history depth 1 instead.

* Build: Add source index to PDBs

Add source information to PDBs so that source files can be retrieved from Github by debugger.

appveyor.yml

@@ -3,9 +3,7 @@ pull_requests:
   do_not_increment_build_number: true
 skip_tags: true
 image: Visual Studio 2017
-shallow_clone: true
-install:
-- cmd: set PATH=C:\Program Files (x86)\WiX Toolset v3.11\bin;C:\Program Files (x86)\HTML Help Workshop;%PATH%
+clone_depth: 1
 build_script:
 - cmd: ClassicStartSrc\ClassicStartSetup\__MakeFinal.bat
 test: off