GeoWebCache update for JAI to ImageN rename of classes and constants

[jodygarnett]

No direct API usage, apparnelty everythign is done via ImageWorker.

Concurrent merge of jai-rename branches:

• JAI to ImageN Rename of classes and constants eclipse-imagen/imagen#115
• ImageIO-Ext update for JAI to ImageN Rename of classes and constants geosolutions-it/imageio-ext#334
• [GEOT-7819] GeoTools update for JAI to ImageN Rename of classes and constants geotools/geotools#5364
• MapFish Print V2 update for JAI to ImageN rename of classes and constants mapfish/mapfish-print-v2#39
• GeoWebCache update for JAI to ImageN rename of classes and constants #1434
• [GEOS-11948] GeoServer update for JAI to ImageN rename of classes and constants geoserver/geoserver#8821

Reviewers: This change requires these branches to be merged at the same time, see upstream pull request for a complete integration test of the jai-rename branches.

[aaime]

I cannot build the branch as-is (using renamed ImageN):

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.14.0:compile (default-compile) on project gwc-core: Compilation failure: Compilation failure: 
[ERROR] /home/aaime/devel/git-gwc/geowebcache/core/src/main/java/org/geowebcache/layer/MetaTile.java:[36,26] cannot find symbol
[ERROR]   symbol:   class JAI
[ERROR]   location: package org.eclipse.imagen
[ERROR] /home/aaime/devel/git-gwc/geowebcache/core/src/main/java/org/geowebcache/mime/ImageMime.java:[29,26] cannot find symbol
[ERROR]   symbol:   class JAI
[ERROR]   location: package org.eclipse.imagen
[ERROR] -> [Help 1]
[ERROR] 

I've made the necessary fixes and pushed a commit to this branch.

[jodygarnett]

Huh, it seems I failed to run the script before making the PR, let me try again and see if it catches this change.

[jodygarnett]

Huh, it seems I failed to run the script before making the PR, let me try again and see if it catches this change.

Sorry about that did not manage to run the update script on this branch so the PR was incomplete. The update script caught a couple things (comments and strings) that would not of shown up as compile error.