Add more verbose logging

[tomasz-oponowicz]

At the moment player isn't verbose whilst parsing manifest or segments. External developers found this annoying.

Actions:

There should be additional log messages in the following areas:

• segment processing;
• manifest processing;

... additionally well-known issues (such as missing crossdomain.xml or .htaccess files) should be highlighted with a reference to a documentation page.

[tomasz-oponowicz]

Well-known issues handling will be moved to different task