D7173: packaging: stage files and dynamically generate WiX installer

[mharbison72 (Matt Harbison)]

mharbison72 added a comment.


  > This change also means that Inno and WiX are now using very similar code for managing the install layout. This means that on disk both packages are nearly identical. The differences in install layout are as follows:
  > ...
  
  I diffed the WiX and Inno installs side by side, and there are a few more differences right before the 5.3 release.  I don't think there's anything critical, but just in case there could be an issue:
  
  - Inno installs `backports.configparser`, `certifi`, `dulwich`, `keyring`, `urllib3`, and `win32ctypes` in library.zip.
  - Inno installs additional *.pyc files in `wsgiref`.
  - ConfigParser.pyc is 24K in WiX, 1.5K in Inno.  Probably related to the backport package being present in Inno.
  - WiX installs a `mercurial.rc`, corresponding to `contrib/win32/mercurial.ini`; Inno does not.
  
  Presumably `dulwich` and `keyring` were thrown in previously to support 3rd party extensions.  Should we do that with WiX?  Before the release?  What about the other discrepancies?

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D7173/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D7173

To: indygreg, #hg-reviewers, durin42
Cc: mharbison72, durin42, mercurial-devel