* Fix #854 Added ViewChannel enum and property to channel permissions

* replaced usages of ChannelPermission#ReadMessages with ViewChannel

* rename parameter of ChannelPermissions constructor

* made OverwritePermissions#ReadMessages obsolete, use ViewChannel instead

* Fix #854 Added ViewChannel enum and property to channel permissions

replaced usages of ChannelPermission#ReadMessages with ViewChannel

rename parameter of ChannelPermissions constructor

made OverwritePermissions#ReadMessages obsolete, use ViewChannel instead

* renamed readMessages parameter in ChannelPermissions constructor and Modify

* fixed channel permission tests to use ChannelPermission enum instead of GuildPermission enum

* replaced usages of readmessages in channel permission tests

* resolve build warnings for permission tests

* initial commit

* Add GuildPermission tests for constructor and modify parameters

* Fixed GuildPermission All value. Previous value had an additional digit that would still resolve to correct permission flags, but raw value would be incorrect. This matches the result of the sum of all GuildPermission flags

* Added raw value check to guild permission modify tests

* Add ChannelPermissions tests