Refactor environment handling logic to separate a server from the environment handler itself

This change makes the environment handling logic execute independent of the server itself and should make it much easier for people to contribute changes and additional environment handlers down the road without polluting the server object even more.

There is still a lot of work to do on this front to make things easier to work with, and there are some questionable design decisions at play I'm sure.

Welcome to additional modifications and cleanup to make this code easier to reason about and work with.

api/process_configuration.go

@@ -47,20 +47,22 @@ func (olm *OutputLineMatcher) UnmarshalJSON(data []byte) error {
 	return nil
 }
 
+type ProcessStopConfiguration struct {
+	Type  string `json:"type"`
+	Value string `json:"value"`
+}
+
 // Defines the process configuration for a given server instance. This sets what the
 // daemon is looking for to mark a server as done starting, what to do when stopping,
 // and what changes to make to the configuration file for a server.
 type ProcessConfiguration struct {
 	Startup struct {
 		Done            []*OutputLineMatcher `json:"done"`
-		UserInteraction []string            `json:"user_interaction"`
-		StripAnsi       bool                `json:"strip_ansi"`
+		UserInteraction []string             `json:"user_interaction"`
+		StripAnsi       bool                 `json:"strip_ansi"`
 	} `json:"startup"`
 
-	Stop struct {
-		Type  string `json:"type"`
-		Value string `json:"value"`
-	} `json:"stop"`
+	Stop ProcessStopConfiguration `json:"stop"`
 
 	ConfigurationFiles []parser.ConfigurationFile `json:"configs"`
 }