refactor: save ProjectBuilder instance in Api instance (#1016)

This reduces dependence on the `builders` module and reduces repitition.

This also facilitates another WIP refactoring I am working on.

bin/templates/cordova/Api.js

@@ -85,6 +85,8 @@ class Api {
             build: path.join(this.root, 'build'),
             javaSrc: path.join(appMain, 'java')
         };
+
+        this._builder = require('./lib/builders/builders').getBuilder(this.root);
     }
 
     /**
@@ -161,7 +163,7 @@ class Api {
             if (plugin.getFrameworks(this.platform).length === 0) return;
             selfEvents.emit('verbose', 'Updating build files since android plugin contained <framework>');
             // This should pick the correct builder, not just get gradle
-            require('./lib/builders/builders').getBuilder().prepBuildFiles();
+            this._builder.prepBuildFiles();
         }.bind(this))
             // CB-11022 Return truthy value to prevent running prepare after
             .then(() => true);
@@ -193,7 +195,7 @@ class Api {
                 if (plugin.getFrameworks(this.platform).length === 0) return;
 
                 selfEvents.emit('verbose', 'Updating build files since android plugin contained <framework>');
-                require('./lib/builders/builders').getBuilder().prepBuildFiles();
+                this._builder.prepBuildFiles();
             }.bind(this))
             // CB-11022 Return truthy value to prevent running prepare after
             .then(() => true);

bin/templates/cordova/lib/build.js

@@ -23,7 +23,6 @@ var nopt = require('nopt');
 
 var Adb = require('./Adb');
 
-var builders = require('./builders/builders');
 var events = require('cordova-common').events;
 const execa = require('execa');
 var CordovaError = require('cordova-common').CordovaError;
@@ -145,7 +144,7 @@ function parseOpts (options, resolvedTarget, projectRoot) {
  */
 module.exports.runClean = function (options) {
     var opts = parseOpts(options, null, this.root);
-    var builder = builders.getBuilder();
+    var builder = this._builder;
 
     return builder.prepEnv(opts).then(function () {
         return builder.clean(opts);
@@ -166,7 +165,7 @@ module.exports.runClean = function (options) {
  */
 module.exports.run = function (options, optResolvedTarget) {
     var opts = parseOpts(options, optResolvedTarget, this.root);
-    var builder = builders.getBuilder();
+    var builder = this._builder;
 
     return builder.prepEnv(opts).then(function () {
         if (opts.prepEnv) {

bin/templates/cordova/lib/run.js

@@ -100,7 +100,6 @@ module.exports.run = function (runOptions) {
         });
     }).then(function (resolvedTarget) {
         return new Promise((resolve) => {
-            const builder = require('./builders/builders').getBuilder();
             const buildOptions = require('./build').parseBuildOptions(runOptions, null, self.root);
 
             // Android app bundles cannot be deployed directly to the device
@@ -110,7 +109,7 @@ module.exports.run = function (runOptions) {
                 throw packageTypeErrorMessage;
             }
 
-            resolve(builder.fetchBuildResults(buildOptions.buildType, buildOptions.arch));
+            resolve(self._builder.fetchBuildResults(buildOptions.buildType, buildOptions.arch));
         }).then(function (buildResults) {
             if (resolvedTarget && resolvedTarget.isEmulator) {
                 return emulator.wait_for_boot(resolvedTarget.target).then(function () {