Gradle build cache support for all tasks

[ramonwirsch]

Basically declared the tasks as @CacheableTask.

Additionally, added programArgs as input property and declared 'source' property as relative

The gradle version was upgraded to 4.0.2. Acceptance tests were modified so that they work for gradle 3.3 up to 4.1-rc1. The simple test cases for jjdoc, jjtree, javacc were replicated to run against gradle 3.3 guaranteeing backwards compatibility even though a newer gradle version is used for building.

This is the Pull-request announced in #42

[codecov-io]

Codecov Report

Merging #43 into master will increase coverage by 0.02%. The diff coverage is n/a.

@@             Coverage Diff              @@
##             master      #43      +/-   ##
============================================
+ Coverage     87.73%   87.75%   +0.02%     
- Complexity        0      150     +150     
============================================
  Files            23       23              
  Lines           432      433       +1     
  Branches         39       28      -11     
============================================
+ Hits            379      380       +1     
  Misses           49       49              
  Partials          4        4

Impacted Files	Coverage Δ	Complexity Δ
.../javacc/compilationresults/CompiledJavaccFile.java
.../javacc/programexecution/JavaccProgramInvoker.java
...avacc/programexecution/AbstractProgramInvoker.java
...s/javacc/programexecution/JjdocProgramInvoker.java
...s/javacc/programexecution/JjdocExecutorAction.java
...inc/gradle/plugins/javacc/JavaccTaskException.java
...ns/javacc/compiler/NonJavaccSourceFileVisitor.java
...gins/javacc/programexecution/ProgramArguments.java
...ca/coglinc/gradle/plugins/javacc/JavaccPlugin.java
.../javacc/programexecution/JjtreeProgramInvoker.java
... and 32 more

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[zbynek]

@ramonwirsch I know it's been 6 years since you proposed the changes, are you still interested in this?

[ramonwirsch]

Uh, I did not even remember I had this open. No, I am no longer on the project that used the javacc plugin, so I personally do not care anymore.