[IMP] app, compiler: introduce t-out

t-out automatically escaped content when it is a string not marked
with the `markup` function

t-out renders the raw content if it is a Block, or if it has been marked
with the `markup` funtion.

t-esc has been kept since it is safe and is optimized to render text nodes.

all t-raw calls are in fact the same as t-out.

tests/compiler/t_set.test.ts

@@ -149,7 +149,7 @@ describe("t-set", () => {
             <span><t t-esc="v1"/></span>
           </t>
           <t t-set="v1" t-value="'after'"/>
-          <t t-raw="v2"/>
+          <t t-out="v2"/>
         </div>`;
 
     expect(renderToString(template)).toBe("<div><span>before</span></div>");
@@ -165,7 +165,7 @@ describe("t-set", () => {
           </t>
           <t t-set="v1" t-value="'after'"/>
           <t t-set="v3" t-value="true"/>
-          <t t-raw="v2"/>
+          <t t-out="v2"/>
         </div>`;
 
     expect(renderToString(template)).toBe("<div><span>before</span></div>");
@@ -181,7 +181,7 @@ describe("t-set", () => {
           </t>
           <t t-set="v1" t-value="'after'"/>
           <t t-set="v3" t-value="false"/>
-          <t t-raw="v2"/>
+          <t t-out="v2"/>
         </div>`;
 
     expect(renderToString(template)).toBe("<div>Truthy</div>");