Fix copy and print restrictions and information

[qnga]

Because license.charactersToCopyLeft and license.pagesToPrintLeft were always null, right informations were wrong, and copy and print were unrestricted.

Fix readium/r2-testapp-kotlin#267

[mickael-menu]

I will wait for the next beta to be out before merging this, as I already did all the tests. For information LCP copy is not yet implemented on Android, so this part was actually not really used.

[llemeurfr]

@mickael-menu when you say LCP copy is not yet implemented on Android, do you mean by the testapp, by all apps you know about, or simply because developers have so far hidden the copy button?

[mickael-menu]

@llemeurfr All of these actually. Do you know any app that actually implemented LCP copy on Android? Technically r2-lcp-kotlin is ready to save right consumption, but it's not trivial to actually implement it in the navigator or reading apps.

[llemeurfr]

In practice all app I've seen so far were blocking copy by deleting the copy/share button, which is far from being perfect, we all agree.

[mickael-menu]

Yes by "not implementing copy" I meant authorizing only the number of characters allowed in the license. The test app is disabling copy indeed.

[mickael-menu]

@qnga Works well, thanks!