Add initial DPI v16 support

[LexiconCode]

The adds initial support for DPI v16. This simply adds the required path for inno-code.iss

Todo:

• Edit documentation to reflect DPI v16 support

Other thoughts
However I think how we handle version numbers within inno-code.iss could improved.

• Better handling of logic when DNS 13 Compiled C++ code is not compatible with DPI 14/15/16
  • DragonVersion := '15'; actually handles DragonVersion 14/15/16 this should be reflected better within the code without relying on absolute version numbers.

[dougransom]

looked at code, checked with author about dragonversion=15 — that is as intended.

[LexiconCode]

looked at code, checked with author about dragonversion=15 — that is as intended.

Yes it is and that is confusing. Why is a confusing?

The installer makes decisions about which compiled .pyd is utilized. This is determined by version numbers.
this is unfortunate because _natlink_core15.pyd actually supports DPI v14/v15/v16 not just DPI v15. _natlink_core13.pyd support only DNS v13 and possibly DNS v12.

The variable dragonversion should actually represent the installed dragon version and there should be logic elsewhere to handle if it's equal or greater than or less than version DPI 14

[LexiconCode]

looked at code, checked with author about dragonversion=15 — that is as intended.

@dougransom

The BestGuessDragonIniDir updates the global variable dragonversion

natlink/InstallerSource/inno-code.iss

Line 15 in 1cd6324

function BestGuessDragonIniDir(): String;

global variable dragonversion is returned in the following function GetDragonVersion

natlink/InstallerSource/inno-code.iss

Line 50 in 1896e74

function GetDragonVersion(Param: String): String;

GetDragonVersion is used when registering .pyd which must be v13 or v15 as those are the only two filenames that exist. See _natlink_core{code:GetDragonVersion}.pyd below

natlink/InstallerSource/inno-setup-natlink.iss

Line 95 in 1cd6324

Filename: "regsvr32"; Parameters: "-s \""{#CoreDir}\_natlink_core{code:GetDragonVersion}.pyd\""" ; StatusMsg: "regsvr32 _natlink_core{code:GetDragonVersion}.pyd"