WIP: Create extra files needed for htmlhelp docs

[RobinD42]

Fixes #966

[RobinD42]

Currently this is not quite working right. The htmlhelp project, index, etc. files are generated by sphinx, but the HtmlHelp Compiler is crashing when run.

[RobinD42]

Apparently the MS help compiler tool has a bug that causes it to crash when there is a . in the middle of a filename (not including the final extension part of the name), or in a folder name, which is followed by an h which causes the tool to try and parse the file as if it was HTML. Even better, this bug has been around for at least a couple decades.

Unfortunately we end up with a ton of files with a .h in the name, like:

_static\images\inheritance\wx.HScrolledWindow_inheritance.png
_static\images\inheritance\wx.HScrolledWindow_inheritance.png.map

So it would take a significant reworking of the document generating and building code to make building a .chm help file possible.

[RobinD42]

FTR:

 >  hhc wxPythonDocs.hhp
Microsoft HTML Help Compiler 4.74.8702

Compiling c:\projects\wx\git\Phoenix\docs\html\wxPythonDocs.chm

HHC3004: Warning: wx.HScrolledWindow_inheritance.png : The HTML tag "√╠{ⁿyy═£Ö3{╬▐│≈√Hƒf∩o¡╜~┐⌡╬┌{µ╠Y≥┌k»²¿0╞ÿÄ│ñ≈jî1¥╞..." is not a valid HTML tag (it does not begin with an alphanumeric character).
HHC3004: Warning: wx.HScrolledWindow_inheritance.png : The HTML tag "µ▌─b8&�├÷ß1∩&�├1▒�╢�Åy7▒�Äë┼░}x╠╗ë┼pL,åφ├c▐M,åcb1l..." is not a valid HTML tag (it does not begin with an alphanumeric character).
HHC3004: Warning: wx.HScrolledWindow_inheritance.png : The HTML tag "µ▌─b8&�├÷ß1∩&�├1▒�╢�Åy7▒�Äë┼░}x╠╗ë┼pL,åφ├c▐M,åcb1l..." is not a valid HTML tag (it does not begin with an alphanumeric character).
HHC3004: Warning: wx.HScrolledWindow_inheritance.png : The HTML tag "δΣÖº1f8,åC2M�D°╟Zì��ï≡gz|EÑ╔≡lô┐2±╫hî�ïßê4²╟�ⁿc..." is not a valid HTML tag (it does not begin with an alphanumeric character).
HHC3004: Warning: wx.HScrolledWindow_inheritance.png : The HTML tag "≈▄ÅJ±ÉHÇ╩╩φ√ y╙·)ô■╥�·ú▌úá¼x�▒Ä~}J█æ╓═╣v}² �,├ÿ:..." is not a valid HTML tag (it does not begin with an alphanumeric character).
HHC3004: Warning: wx.HScrolledWindow_inheritance.png : The HTML tag "è¿₧�µ─��┬$��·Y±û╖<PèßYgm)₧~·{╜öY¿ç▓��Ä)�(úƒÇΣ─É≤(┤..." is not a valid HTML tag (it does not begin with an alphanumeric character).
HHC3004: Warning: wx.HScrolledWindow_inheritance.png : The HTML tag "≥E?╟"ª≈3]w°≡╤╧;∩sσ╬pσ╩/ò»√≈ ñL�Στ:êφÆiº�iÜ�   rτÉ÷..." is not a valid HTML tag (it does not begin with an alphanumeric character).
Segmentation fault