Remove unessential non-ascii symbols from source

Remove unessential non-ascii symbols from source

Several files contain symbols like zero width space,
unusual apostrophe, dash and several national symbols
instead of English.

This might be error prone (please see more details
in the issue).

Replace them to allow upcoming non-ascii validator
to pass.

Components: Framework

VK-GL-CTS issue: 1836

Change-Id: I3a274f14d117d5b1362f6ceeb20f096c8680b362