Update version of conf.d/app-templates submodule.

Update version of conf.d/app-templates submodule.

Changes of conf.d/app-templates:
(3dc85ec - Thierry Bultel) common.cmake: fixed erroneous search path for os-release
(7fa5e5a - Romain Forlot) Fix: missing gcov symbol in compiled binaries
(76e12e7 - CorentinLGS) app-templates doc: Changed doc to fit new format.
(02f45f1 - Romain Forlot) Update Docs
(52ae181 - Romain Forlot) Fix: typo
(f0b24b0 - Romain Forlot) Rollback about TEST build type
(e841a77 - Romain Forlot) Adding a TEST build type
(994ebc1 - Romain Forlot) Change default compilation options.
(85d5ffd - Romain Forlot) Test widget only if there are test materials
(d14bdce - Romain Forlot) Handles more test LABELS.
(70cf8fd - Romain Forlot) Missing flag for COVERAGE build type
(3c99b8a - Romain Forlot) Create a test widget
(9c1a0fb - Romain Forlot) Fix: interpreted '&' character
(9202fac - Romain Forlot) More accurate comment about widget template file.
(f94e45e - Romain Forlot) Align sample on actual default compile options
(d0acc2a - Romain Forlot) Add support to binding version 3.
(6fb3846 - Romain Forlot) Warning if not using wgtpkg-pack to make a widget
(35f3af1 - Sebastien Douheret) Rework CMAKE_INSTALL_PREFIX and INSTALL_PREFIX var
(332f377 - Romain Forlot) Be able to overwrite BUILD_TYPE using CLI
(1ec7531 - Romain Forlot) Use CACHE variable for other common CMAKE variable
(0880356 - Romain Forlot) Fix:: wrong wgt using RELEASE BUILD TYPE
(eec9f07 - Romain Forlot) Fix: SYSROOT location detection... Wrong test.
(291aa4e - Romain Forlot) Change the default debug compilation options.
(22a2cbf - Romain Forlot) Clearer coverage compilation options configuration
(aa68dbd - Romain Forlot) Don't overwrite the autobuild script if it exists
(a13e7b9 - Romain Forlot) Disable the in-tree build method.
(51026d2 - Romain Forlot) Detect Yocto as OS distribution
(1f2944e - Romain Forlot) Fix: wrong compile options added
(92646f6 - Romain Forlot) Fallback using zip format if no wgtpkg-pack found
(f65761c - José Bollo) 02-variables.cmake: Avoid checking CXX version if not required
(3965d37 - José Bollo) config.cmake.sample: Remove dependency to libsystemd
(a45ae0c - José Bollo) config.cmake.sample: Remove dependency to libmicrohttpd
(9b17efe - Thierry Bultel) Added -D_FORTIFY_SOURCE=2 to CFLAGS
(66f7bc8 - Thierry Bultel) start-on-target: uses RSYNC_PREFIX path for config
(e400fb3 - Sebastien Douheret) Fixed spelling.
(6621af0 - Romain Forlot) Improve OS detection
(829dd69 - Romain Forlot) Fix: OS detection
(8f5a17b - Romain Forlot) Launch from workdir
(72ca4ff - Romain Forlot) Change closing that could fix native debugging
(6e1a3c3 - Romain Forlot) Fix filename pattern to match .cmake files
(30e78a5 - Romain Forlot) Adding cmake file at the root directory
(a3c312e - Romain Forlot) Adds commit hash to the version.
(6c0e9e4 - Romain Forlot) Change default sample settings.
(dd0cec7 - Romain Forlot) Forgot updating README also...
(66d0ca1 - Romain Forlot) Update documentation
(4b26503 - Romain Forlot) Use LFSH named, rename data to var
(bb3c541 - Romain Forlot) Use new CPP generation from afb-genskel

Change-Id: I93b9c1fcb62b40726a9b5fb8b415f4f5ce7f8ae6
Signed-off-by: Frederic Marec <frederic.marec@iot.bzh>
(cherry picked from commit d0a4331afd096d89325c213d7e933e96bee5b722)