Add copyright and license information headers to the source code files
inside the `web` directory and the `capa/render/proto/capa.proto` file.
I have used addlicense to add the headers.
* web explorer: make function count reflective when show-lib-func is
toggled on/off
* introduce match-count class to mute and minimize match count text labels
* fix typo
This commit:
- add two new base CSS utility classes
- stores the results of parsing in sessionStorage for reuse
- add a new settings option `Show column filters`
- replaces ../../../ with a path shortcut
