coverage->100%, refactor priorities, add more tests to prioritypool (#19

)

* coverage->100%, refactor priorities, add more tests to prioritypool

* fix some scruitinzer stuff

Refactoring of Pool (#18)

* initial

* handle priorities, and fix run colleciton

* Large refactoring of Pool

- `Pool` is now a simple collection of runs
- `PriorityPool` is more complex and ensure runs are started in priority order
- Moved output classes to `Display` namespace
- Added a `PoolLogger` monitor to log when a pool/run changes
- Refactored run state into `RunningStateTrait`, which also handles duration

* update copyright and examples

* update depdencies, logger

* lint

* some scrutinizer changes

* update README

Callback run (#17)

* add a CallbackRun runner

* increase coverage

* fix lint

* remove type comparison between float and int

Events events events (#16)

* add events, and make lines and tables dumber

* test progress bar on table

* add some debugging, remove me

* remove debug

* make table progress bars colourful

* progress returns [pos,max,perc]

* trigger pool updated event on poll not run

* update copyright, 100% coverage

* handle exception passthrough

* dont require console-diff-renderer

* make default bar use ▏characters

* copyright

* fix composer file

* remove PHP_INT_MIN constant

* fix examples

allow a pool to instantly run processes/runs (#15)

* allow a pool to instantly run processes/runs

* update makefile to current best practice

* add composer php version setting

* set composer file to php version

* some fixes, tidy makefile a tiny bit

* doc comment tidy

* handle multple lines as response

* split child output on new line

* filter out blank lines

Composer: allow Symfony 4 (#14)

Write all of the output from each process to the screen (#12)

* add output to screen options

* fix lint, dont assume 0.00s

* make $onStart protected in pool

* split out tags into trait, update some code formatting

* better null check

add a limit to the number of concurrent processes (#9)

* limit the number of concurrent processes

* use 0.6.1 so table renders nicely

* clear summary on completion

Filtering (#5)

* filter the output from applications

* update diff renderer

* add a show output flag

Output interface (#4)

* use OutputInterface

* update compose