v1.0.9 - Mainly fixes

• 1.0.9
  • Fixed a GetCapabilitiesMetadata bug that caused some VCP features to lack metadata values.
  • Fixed the return of feature-name and feature-description from GetVcpMetadata.
  • Fixed potential hot-plug/DPMS polling memory leaks and simplified event locking.
  • Recoded hot-plug/DPMS polling to avoid a potential libddcutil assertion failure.
  • Fixed code/doc typos, improved code readability/structure, reduced IDE warnings.
  • Updated documentation to caution against excessive updates when coding loops, as this may impact VDU NVRAM lifespan.
  • Updated documentation to caution against experimenting with non-standard features, as it may risk damage to the VDU.
  • Added an optional ddcutil-client, a fast counterpart to ddcutil. Not built/packaged by default (unnecessary).