`TARGET_ARCH` has exactly the same values as `VS_PLATFORM` - "x64", "ARM", "ARM64") except it has `x86` instead of `Win32`, but this value is never actually used, so both variables end up using interchangeably, making code harder to reason about - you needed to remember that they're exactly the same except the case when the variable is passed directly to VS (either through `cmake -A` or some `msbuild` command), then user must use `VS_PLATFORM`. So we might just use one variable always.
`START` is set to `0` for "amd64" / "x64" and `1` in all other cases, effectively just skipping `GENERATORS[0]` in case when "amd64" or "x64" is present.
Which is now useless, since `GENERATORS[0]` doesn't exist anymore.
They were added awhile ago in 67666ed for overcoming some win32 issues, which is not around anymore.
And now `VS_HOST` is never set (and therefore `VS_TOOLSET_HOST` is always empty too) and likely to be never used.
To make it a bit more easier to understand what to do in cases like below (the solution is to provide generator explicitly: `run-cmake.bat vs2022-x64 -DADD_COMMIT_SHA=ON -DVERSION_OVERRIDE=ON`).
```
run-cmake.bat -DADD_COMMIT_SHA=ON -DVERSION_OVERRIDE=ON
vs-cfg.cmd: The used CMake version does not support generator `-DADD_COMMIT_SHA` - cannot proceed.
```
Limited compatibility to Visual Studio 2013 or newer
Fixed the missing 'd' suffix linking ....\opencollada\xmld.lib
Fixed failure when calling the scripts without specifying a generator
Changes to the build scripts to support Visual Studio 2019, to optionally use a toolset different from the default and to build correctly when more than a single Visual Studio version is installed.
* Make possible to invoke run-cmake.bat, build-ifcopenshell.cmd (now bat), install-ifcopenshell.cmd (now bat) directly from File Explorer or command prompt without VS env vars set, if BuildDepsCache file exists, by utilizing CMake's --build functionality. Do not delete CMakeCache.txt always now in order to keep the build options consistent.
* win/readme.md tweaks + make the line width smaller
* Windows batch files: use the last modified BuildDepsCache. Show an error if GEN_SHORTHAND does not exist.
Andrej730