Gwenhywfar

Base: Fixed a bug in GWEN_SimplePtrList_free()

base: Added function GWEN_SimplePtrList_Clear().

base: Added function GWEN_SimplePtrList_Set/GetUserIntData().

base: Added support for GWEN_INHERIT to GWEN_SIMPLEPTRLIST

base: Fixed a bug in GWEN_SimplePtrList(), added another test.

base: Improved GWEN_SIMPLEPTRLIST

- can now attach to/detach from objects whose pointers are stored
- fixed a newly introduced bug (tests are really great!)

base: Free objects in tests for GWEN_SimplePtrList.

crypt3: fixed a compiler warning.

crypt3: Added convenience function GWEN_MDigest_Digest()

base: Added GWEN_SimplePtrList with test code

- introduce a fast pointer list (needed by AqDatabase) with lazy copying
and copyOnWrite capabilities
- introduce test code accompanying modules (first: simpleptrlist-t.c)

Prepared release 4.99.25rc9

Fix mismatching number of arguments from 497436bd

SIO: More work on server mode http session.

gwentest: Fixed a bunch of compiler warnings.

SIO: More work on passive http session.

SIO: Added function GWEN_HttpSession_SendResponse()

- this function is used in server mode

Fixed gcc warnings.

Rewire gwenhywfar-config to use pkg-config

Replace all functionality behind '--with-gwen-dir' with usage of the PKG_CONFIG_PATH environment variable

• Suggest setting that environment variable when gwenhywfar.pc is not found
• Abort if '--with-gwen-dir' is still used, but print a helpful error message...

Minor tweaks

- refer to git instead of to svn
- use https for the website references

Replace gwhenhywfar-config use with pkg-config

For this the gwenhywfar.pc now needs to expose more variables.

Fix typo that confused Param_Type with Param_DataType in test code.

Fix typo that confused the cryptAlgoId with cryptAlgoMode in CryptAlgo_toDb(), as pointed out by clang.

Update of travis configuration: Use newer Ubuntu 18.04 "bionic" environment instead of 16.04.

Also, run make check, too, but only without network checks.

Fix Clang compiler warning that GWENHYWFAR_API must not appear for struct declaration.