Incorporate kcaplugin into build system

The kcaplugin repo gets installed at plugin\kcacred.
If present, it will be built.

Change-Id: Ia4b18fb79397a14acc130409b59821002954cc85
Set Install Feature levels

A Feature level of '1' means always install.

A Feature level of '3' is used to indicate typical install.

A Feature level of '5' is used to indicate custom install only.

The INSTALLLEVEL property is set to 3.  Levels higher than that
are not installed by default.  Debug symbols are set to '5'.

Change-Id: I1add878e548862661baca2aecd2f1df8c2c15782
Add NetIDMgr install directory to PATH

In order for third party plugins to find the netidmgr api dll its
directory must be in the PATH environment variable.

Change-Id: I3a34f11979267b7f733445de9e0d2cb19ba6c02e
Fix manifest macros to use $(CP) instead of $(COPY)

$(COPY) is not defined in the NetIDMgr build system.

Change-Id: I38d55aaae1ee324eac6a8dc5cb16857c13881e9e
Heimdal plugin define UseKrbCompat if BUILD_KRBCOMPAT

When building the Heimdal plugin if BUILD_KRBCOMPAT rules are
being used define UseKrbCompat as a wix variable so that the
appropriate merge modules can be included.

Change-Id: I3e0b3a4a0b7db657618734e181ab61af9fc924e1
Version 2.4.99 Private

A private build with pre-release Heimdal 1.6 merge modules and
integrated KCA plugin.

Change-Id: I322f00b7d63c09c11b969b016a87ed8bae8c33ec