Improve code generation

[SamCarlberg]

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UI

• [x] Remember the previous save location
• [x] Keep track of the save location (possibly as a project setting)
• [x] ~~Offer options for "Generate" and "Generate as", similar to the common "Save" and "Save as"~~ pipeline name can be set every time code is generated
• [x] Offer option to implement WPILib VisionPipeline interface (https://github.com/wpilibsuite/allwpilib/pull/388)
• Offer custom options on a per-language basis:
  • All
    • [x] Set the pipeline class name
  • Java
    • [x] Package name (currently, there's no package declaration)
  • C++
    • [ ] CUDA option
    • [ ] TAPI option
  • Python
    • [x] Module name (= file name)
    • [x] Pipeline class name (should NOT be the same as the module name)

Generated code

• [ ] Have a data type containing common properties of contours (center point, width, height, area) and possibly other commonly used OpenCV data types
• [ ] Make operation inputs from UI controls (threshold values, filters, etc.) be class constants instead of local variables
• Java (and possible C++)
  • [x] ~~Properly capitalize setsourceX() to setSourceX()~~ setSource mehods were removed
  • [ ] Fix docs
  • [ ] Only import required classes
  • [ ] Make list variables use the List<Foo> type instead of ArrayList<Foo>
    • [ ] Use diamond operator on constructor: List<Foo> foo = new ArrayList<>();
• C++
  • [x] Put all GRIP stuff in its own namespace
  • [x] Remove all using namespace foo declarations
  • [ ] Only include required headers
• [ ] Be able to use TAPI
• [ ] Be able to use CUDA

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CUDA API docs: http://docs.opencv.org/3.1.0/d1/d1e/group__cuda.html