RFR: 8289255: update Eclipse .classpath and other configuration files [v7]

[Andy Goryachev]

On Wed, 6 Jul 2022 21:38:36 GMT, Andy Goryachev <duke at openjdk.org> wrote:

>> summary of changes:
>> - fixed .classpath files
>> - set UTF-8 encoding in the eclipse project config files
>
> Andy Goryachev has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8289255: removed 3DViewer test folders from .classpath

Nir:
I've merged your branch into mine (ag.apps, not yet pushed).  
Two things:
1. Even though apps/.project has no nature, opening it in eclipse results in 30K errors (class not found)
2. when I close apps/ project, I get the following errors in systemTests:

Description	Location	Path	Resource
The package myapp3.pkg2 does not exist or is empty	line 33	/systemTests/src/testapp3/java/mymod	module-info.java
The package myapp3.pkg3 does not exist or is empty	line 34	/systemTests/src/testapp3/java/mymod	module-info.java
The package myapp3 does not exist or is empty	line 30	/systemTests/src/testapp3/java/mymod	module-info.java
The project was not built due to "module-info [in module-info.java [in mymod [in src/testapp2/java [in systemTests]]]] does not exist". Fix the problem, then try refreshing this project and building it since it may be inconsistent	Unknown		systemTests

Do we really need a .project file in apps/?

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PR: https://git.openjdk.org/jfx/pull/804