Do not use Boost in SDK examples

Change-Id: I8b2af447fe3ee29261e538a53b4624ff8b6c4d1e
Keep using component_getImplementationEnvironment in extensions

...instead of relying on the implicit CPPU_CURRENT_LANGUAGE_BINDING_NAME
convention.  Keeping that convention an implementation detail makes it easier to
do improvements in the future.  (Theoretically, the bundled extension in mysqlc
could be considered internal code and not adapted, but just be safe.)

Change-Id: Iae41a6e072dabc2bf7c1481ba6cfed61680edf37
Adapt all (non-extension, SharedLibrary) .components to environment="..."

Change-Id: I56f38bd786f3a026cb2908f28540dc9c4003af83