Locate certificate authority data at runtime for better portability

Use peeking instead of seeking when determining file input format, in case input stream is not seek-able.

Correctly support prefix matching on URLs for credential export

Add support for cross-compiling portable Linux binaries using Docker.

Support running configure and building the code from other directories

Add the capability to import and export credentials.

Move the default location for credential data storage to follow the XDG Base Directory specification.

Add missing include

Add missing space

Fix a typo

Add a safety net to catch running make before configure

Fix example indentation

Initial import