webos-image: pmloglib=54,v3.2.0

:Release Notes:
Introduced cmake options SHIP_HEADERS_ONLY and BUILD_WITHOUT_HEADERS to
control how binaries (shared libraries) and public headers are
built/installed. Also added /var/preferences/pmloglib/overrides.conf to
change log levels after building image while keeping changes persistent
between device boots.

:Detailed Notes:
pmloglib submissions/52..submissions/54:
48fef4b bump version 3.2.0 before integration
3f26ea5 add overrides.conf placed on r/w partition
836916c migrate to webos_include_install_paths
9dac8c8 Add ability to install headers separately

:Testing Performed:
- miniBAT
- BAT
- verified overrides.conf as described in 3f26ea5

:QA Notes:

:Issues Addressed:
[BHV-1839] [pmloglib] Deploy headers independently from the built targets
[CMB-1112] Implement global severity overriding
[CMB-1244] CCC: pmloglib=54,v3.2.0

Open-webOS-DCO-1.0-Signed-off-by: Nikolay Orliuk <nikolay.orliuk@lge.com>
Change-Id: I071c5284d9a4ab68de1c89b96fe7e384a8c5b404
Originally-reviewed-on: https://gpro.palm.com/59639
Reviewed-on: https://g2g.palm.com/6430
Reviewed-by: Martin Jansa <Martin.Jansa@lge.com>
Tested-by: Martin Jansa <Martin.Jansa@lge.com>
Reviewed-by: Susan Montooth <susan.montooth@lge.com>