DOC: indicate the "Playback Vertical Slice"

this is just an "interpretation" of the current architecture diagram,
created for inclusion into the developer report, indicating those components
to be augmented and integrated to get a simple render/playback to work

doc/devel/draw/Lumi.Architecture-2.svg

@@ -286,11 +286,11 @@
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      inkscape:pageopacity="0.0"
      inkscape:pageshadow="2"
-     inkscape:zoom="1"
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+     inkscape:cx="475"
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      inkscape:document-units="mm"
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@@ -328,6 +328,8 @@
           </cc:Agent>
         </dc:publisher>
         <dc:description>Overview Layers, Components and Relations
+
+envisioned Lumiera Architecture 2022
 </dc:description>
       </cc:Work>
       <cc:License
@@ -349,7 +351,7 @@
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@@ -425,7 +427,7 @@
   <g
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-     id="layer1"
+     id="l1_compo"
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@@ -1891,7 +1893,7 @@
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   <g
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+     id="l1b_coreComp"
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