[Exporters] Add support for Eclipse Export

[sarahmarshy]

Description

Adds support for Eclipse exporting. The exported project supports building with polymorphic makefiles (IAR, GCC, and ARMc5) and debugging with pyocd. The export comes with .cproject and .project eclipse files, a py_ocd run/debug launch file, and a pyocd eclipse plugin quick install p2f file.

Status

READY

Related PRs

#2577

Steps to test or reproduce

To export and build:

1. Either of the following:
   mbed export -m whatever -i eclipse_gcc_arm
mbed export -m whatever -i eclipse_armc5
mbed export -m whatever -i eclipse_iar
2. Open Eclipse
3. File>Import>General>Existing Project into Workspace>Next
4. Browse>Select the root directory of exported project
5. Right click the project in the explorer>Build Project

To Run (cannot run with armc5 built binary):

1. Install Pyocd Eclipse plugin if you do not have it.
   A. File>Import>Install>Install Software Items From File>Next
   B. Browse>Root/of/your/project/eclipse-extras/necessary_software.p2f
2. Pip install pyocd if you don't have it.
3. Run>Run Configurations
4. Expand GDB PyOCD Debugging and select the generated configuration in the form of targetname_py_ocd_settings.
5. Select Debugger tab
6. Select Variables next to Executable textbox
7. Select Edit Variables....
8. Select pyocd_path and "Edit..."
9. Change its value to that of your Python Scripts directory (mine is C:\Python27\Scripts)
   A. This assumes that you have pyocd installed and pyocd-gdbserver.exe is in this folder as a result
10. Run!

To Debug:

Follow all Run steps but substitute 'Debug Configurations' for 'Run Configurations' in step 3. The pyocd_path variable value will persist if you have followed these steps for running. If you wish to debug with an armc5 generated binary, you will need to flash the board yourself, then you can debug. The debugger will not try to load the executable before debugging if it is an armc5 project.

@sg- @theotherjimmy @screamerbg

[sg-]

py_ocd_settings.tmpl should be pyocd_settings.tmpl

[0xc0170]

LGTM, once pyocd names are corrected

[screamerbg]

@sarahmarshy Awesome! LGTM