cpdb-libs 2.0b5

In the fifth beta release for cpdb-libs 2.0.0 we have made sure frontend/backend communication is pure D-Bus so that everything works also with sandboxed packaging and we have fixes several bugs, including a security issue.

• Removed browsing for backends via file system
  The frontend should only shout into the D-Bus to find out which backends are available and to communicate with them. Depending on the way (for example sandboxed packaging, like Snap) how the frontend and backand are installed the frontend cannot access the host's or the backend's file systems (PR #27).
• Limit scanned string length in scanf()/fscanf() functions
  cpdb-libs uses the fscanf() and scanf() functions to parse command lines and configuration files, dropping the read string components into fixed-length buffers, but does not limit the length of the strings to be read by fscanf() and scanf() causing buffer overflows when a string is longer than 1023 characters (CVE-2023-34095).
• Fixed memory bugs leading to leaks and crashes (PR #26)
• Build system: Removed unnecessary lines in tools/Makefile.am
  Removed the TESTdir and TEST_SCRIPTS entries in tools/Makefile.am. They are not needed and let make install try to install run-tests.sh in the source directory, where it already is, causing an error.