Feat/model backed ui (#1145)

This is an initial PR for a new model-driven UI where extensions can provide definitions of the components & how they're laid out using Containers.
#1140, #1141, #1142, #1143 and #1144 are all tracking additional work needed to improve the initial implementation and fix some issues with the implementation.

Features:
- Supports defining a FlexContainer that maps to a flexbox-based layout.
- Supports creating a card component, which is a key-value pair based control that will lay out simple information to a user. Eventually this will have an optional set of actions associated with it.
- Has a sample project which shows how to use the API and was used for verification

samples/sqlservices/tslint.json

@@ -0,0 +1,123 @@
+{
+  "rules": {
+    "align": [
+      true,
+      "parameters",
+      "statements"
+    ],
+    "ban": false,
+    "class-name": true,
+    "comment-format": [
+      true,
+      "check-space"
+    ],
+    "curly": true,
+    "eofline": true,
+    "forin": true,
+    "indent": [
+      true,
+      "tabs"
+    ],
+    "interface-name": true,
+    "jsdoc-format": true,
+    "label-position": true,
+    "label-undefined": true,
+    "max-line-length": [
+      true,
+      160
+    ],
+    "member-access": false,
+    "member-ordering": false,
+    "no-any": false,
+    "no-arg": true,
+    "no-bitwise": true,
+    "no-conditional-assignment": true,
+    "no-consecutive-blank-lines": false,
+    "no-console": [
+      true,
+      "debug",
+      "info",
+      "time",
+      "timeEnd",
+      "trace"
+    ],
+    "no-construct": true,
+    "no-constructor-vars": false,
+    "no-debugger": true,
+    "no-duplicate-key": true,
+    "no-duplicate-variable": true,
+    "no-empty": true,
+    "no-eval": true,
+    "no-inferrable-types": false,
+    "no-internal-module": true,
+    "no-null-keyword": true,
+    "no-require-imports": false,
+    "no-shadowed-variable": true,
+    "no-string-literal": false,
+    "no-switch-case-fall-through": false,
+    "no-trailing-whitespace": true,
+    "no-unreachable": true,
+    "no-unused-expression": false,
+    "no-unused-variable": true,
+    "no-use-before-declare": true,
+    "no-var-keyword": true,
+    "no-var-requires": false,
+    "object-literal-sort-keys": false,
+    "one-line": [
+      true,
+      "check-open-brace",
+      "check-catch",
+      "check-else",
+      "check-finally",
+      "check-whitespace"
+    ],
+    "quotemark": [
+      true,
+      "single",
+      "avoid-escape"
+    ],
+    "radix": true,
+    "semicolon": true,
+    "switch-default": true,
+    "trailing-comma": [
+      true,
+      {
+        "multiline": "never",
+        "singleline": "never"
+      }
+    ],
+    "triple-equals": [
+      true,
+      "allow-null-check"
+    ],
+    "typedef": [
+      true,
+      "call-signature",
+      "property-declaration"
+    ],
+    "typedef-whitespace": [
+      true,
+      {
+        "call-signature": "nospace",
+        "index-signature": "nospace",
+        "parameter": "nospace",
+        "property-declaration": "nospace",
+        "variable-declaration": "nospace"
+      }
+    ],
+    "use-strict": false,
+    "variable-name": [
+      true,
+      "allow-leading-underscore",
+      "ban-keywords"
+    ],
+    "whitespace": [
+      true,
+      "check-branch",
+      "check-decl",
+      "check-operator",
+      "check-separator",
+      "check-type"
+    ]
+  }
+}