Rename "com.fasterxml.jackson" -> "tools.jackson"

[cowtowncoder]

(see FasterXML/jackson-core#793 for background)

As the main task for JSTEP-1 (https://github.com/FasterXML/jackson-future-ideas/wiki/JSTEP-1) we need to:

1. Change Maven package group id from "com.fasterxml.jackson.core" to "tools.jackson.core"
2. Change Java Package name from "com.fasterxml.jackson.core" to "tools.jackson.core"

as well as all secondary changes for OSGi and Java module system.

[cowtowncoder]

@dinomite @Spikhalskiy I did first mechanical part, and can see if I can resolve API differences. But will probably need help with repackaging of Kotlin classes themselves; it's hopefully quite mechanical. It is also likely there are some behavioral differences resulting in test failures once everything compiles again.

[RealYusufIsmail]

can i help with this

[cowtowncoder]

@RealYusufIsmail Possibly? There are couple of compilation failures, and then the straight-forward renaming. So PR would be welcome.

[RealYusufIsmail]

will hopefully make one tomorrow

[RealYusufIsmail]

@RealYusufIsmail Possibly? There are couple of compilation failures, and then the straight-forward renaming. So PR would be welcome.

starting working on it. Created a pr #598

[cowtowncoder]

Implemented with @RealYusufIsmail's PR -- left some test failures, probably unrelated to renaming (but formerly masked due to dependencies to older, pre-rename core Jackson 3.0.0-SNAPSHOT components):

[ERROR] Tests run: 234, Failures: 0, Errors: 9, Skipped: 6

I'll file a follow-up for solving test failures.