Bindata is optional and over-writable on restart (#354)

* Moved conf assets into options folder

* Dropped old bindata

* Started to integrate options bindata and accessors

* Do not enforce a builtin app.ini

* Replaced bindata calls with options

* Dropped bindata task from makefile, it's the generate task now

* Always embedd app.ini to provide sane config defaults

* Use sane defaults for the configuration

* Defined default value for SSH_KEYGEN_PATH

* Dropped "NEVER EVER MODIFY THIS FILE" header from app.ini

* Fixed new paths in latest test additions

* Drop bindata with make clean task

* Set more proper default values

modules/options/options.go

@@ -0,0 +1,51 @@
+// Copyright 2016 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package options
+
+//go:generate go-bindata -tags "bindata" -ignore "TRANSLATORS" -pkg "options" -o "bindata.go" ../../options/...
+//go:generate go fmt bindata.go
+//go:generate sed -i.bak s/..\/..\/options\/// bindata.go
+//go:generate rm -f bindata.go.bak
+
+type directorySet map[string][]string
+
+func (s directorySet) Add(key string, value []string) {
+	_, ok := s[key]
+
+	if !ok {
+		s[key] = make([]string, 0, len(value))
+	}
+
+	s[key] = append(s[key], value...)
+}
+
+func (s directorySet) Get(key string) []string {
+	_, ok := s[key]
+
+	if ok {
+		result := []string{}
+		seen := map[string]string{}
+
+		for _, val := range s[key] {
+			if _, ok := seen[val]; !ok {
+				result = append(result, val)
+				seen[val] = val
+			}
+		}
+
+		return result
+	}
+
+	return []string{}
+}
+
+func (s directorySet) AddAndGet(key string, value []string) []string {
+	s.Add(key, value)
+	return s.Get(key)
+}
+
+func (s directorySet) Filled(key string) bool {
+	return len(s[key]) > 0
+}