Remove LegacyND2Reader and options

[dgault]

This the follow up to #4030

• LegacyND2Reader has been removed
• ND2Reader has been removed
• NativeND2Reader has been renamed to ND2Reader and deprecation flags removed
• Options to use the LegacyReader in Bio-Formats Plugins have been removed

[melissalinkert]

Diff looks fine to me; only thought is it's going to be a little difficult to look at historical changes to what used to be NativeND2Reader, as git log -p ND2Reader.java or similar won't show commits on NativeND2Reader. Would it be worth doing something like:

• git rm ND2Reader.java
• git mv NativeND2Reader.java ND2Reader.java

so that git log --follow -p ND2Reader.java can show the history of NativeND2Reader.java?

[sbesson]

Seconding @melissalinkert's comment, I think it would be valuable to evaluate if ND2Reader could inherit the history of NativeND2Reader from a maintenance perspective.

Two other suggestions/comments:

• should lib/LegacyND2Reader.dll also be removed as part of this PR?
• while reviewing Remove reference to LegacyND2 bio-formats-documentation#319, I was reminded of nativend2.chunkmap option. Would we consider renaming the option as nd2.chunkmap? And if so, would it be feasible to keep nativend2.chunkmap as a property alias (and deprecate it for 8.0.0)?

[dgault]

Closing this to open a fresh PR that retains the NativeND2Reader history for ND2Reader