user.home
Support loading a `.spring-boot-devtools.properties` file from the users home folder. The property file can be used to customize settings that make sense on a per-user basis, but might not want to be checked into the project. Fixes gh-3151
Allow the pollInterval and the quietPeriod of the filewatcher to be configured. Fixes gh-3139
Update `FileSystemWatcher` to support the concept of a "trigger file" which could be written by an IDE when a reload needs to occur. Fixes gh-3157
Fixes gh-3099
