Add Event Bus (#184)

Major internal refactor to use an event bus to pass event/messages along. These changes are largely invisible user facing but sets up internal design for real time stats and information.

- `--watch-config` logic refactored for events
- remove multiple SSE api endpoints, replaced with /api/events
- keep all functionality essentially the same
- UI/backend sync is in near real time now

proxy/process.go

@@ -13,6 +13,8 @@ import (
 	"sync"
 	"syscall"
 	"time"
+
+	"github.com/kelindar/event"
 )
 
 type ProcessState string
@@ -127,6 +129,7 @@ func (p *Process) swapState(expectedState, newState ProcessState) (ProcessState,
 
 	p.state = newState
 	p.proxyLogger.Debugf("<%s> swapState() State transitioned from %s to %s", p.ID, expectedState, newState)
+	event.Emit(ProcessStateChangeEvent{ProcessName: p.ID, NewState: newState, OldState: expectedState})
 	return p.state, nil
 }