Minor fixes in base_tasks (process->perform), fix in build_from_config. Add InstrTaskInterface to api. Add a has_view class attr to task interface to specify whether or not the interface has an associated view.
Move dependencies management into their own classes, fix all kind of inconstitencies in task_manager system, all the related tests pass.
Minor fixes in MeasurementPlugin : _xx_extensions dict were never cleared.
Update subprocess to correctly use build_from_config.
Rename SetVoltageTask interfaces and add views for MultiChannel one.
Fix base_tasks. ComplexTasks and RootTask were still relying on process and process_
Same for LoopTasks.
Update runtime dependencies collections logic (and use). Now the collecters get passed the id of the caller plugin (was mandatory for profiles). The command in TaskManger must have a trigger when requesting runtimes.
Update tests on measurement sytem (all pass).