hh_compiler: add usage and diagnostic messages

[johnd0e]

Every time (if I haven't edited the help files for a long time), I run into the issue of CHM compilation failing.
And each time, it takes some time before I figure out the cause.
The reason is trivial: the Microsoft HTML Help Workshop must be installed.
However, hh_compiler.exe simply exits silently without any error messages.
Given that it doesn't output any messages upon launch, it's initially unclear whether it's working at all.

Therefore, I've added the following messages:

Usage:

Usage: D:\xxx\FarManager\enc\tools\hh_compiler\hh_compiler.exe <CodePage> <InputHHP>

Error encountered

[*] Target CodePage: 1
[*] Loading hha.dll...
[!] LoadLibraryA("hha.dll") failed. Error: 126

--------------------------------------------------------------------------------
RECOMMENDATION:
Microsoft HTML Help Workshop should be installed.
--------------------------------------------------------------------------------

Normal flow

[*] Target CodePage: 1251
[*] Loading hha.dll...
[*] Patching function: GetACP
[*] Patching function: MultiByteToWideChar
[*] Patching function: WideCharToMultiByte
[*] Starting compilation of 'pluginsr.hhp'...
Microsoft HTML Help Compiler 4.74.8702

Compiling d:\xxx\FarManager\enc\build\chm\ru\FarEncyclopedia.ru.chm

...

[*] CompileHHP finished successfully.

[sonarqubecloud]

Quality Gate passed

Issues
19 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[sonarqubecloud]

Quality Gate passed

Issues
29 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[johnd0e]

The next thing I usually try is, instead of installing that legacy piece of software into my system,
I just copy hha.dll into the hh_compiler\ directory.
Of course, that is not enough: "HHC6003: Error: The file Itircl.dll has not been registered correctly."
Unfortunately, this message is not helpful at all, and there is even no solution in the first Google search results.
That's why I added special handling for this case:

--------------------------------------------------------------------------------
RECOMMENDATION:
Make sure that `itcc.dll` exists and run the following command
with Administrator privileges:
rundll32 "D:\xxx\FarManager\enc\tools\hh_compiler\itcc.dll",DllRegisterServer

ERROR:
The required file was NOT found at the expected location:
D:\xxx\FarManager\enc\tools\hh_compiler\itcc.dll
--------------------------------------------------------------------------------

So yes, in general, there is no need to install the full HTML Workshop package; it's enough to have just two files of its content.

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[alabuzhev]

RECOMMENDATION:
Microsoft HTML Help Workshop should be installed.

RECOMMENDATION:
Make sure that itcc.dll exists and run the following command
with Administrator privileges:
rundll32 "D:\xxx\FarManager\enc\tools\hh_compiler\itcc.dll",DllRegisterServer

So what is the 'recommended' way?
Install it normally or mess with random dlls?