Update Bazel icon from original icon

[why]
The Bazel icon might look nicer with gaps between the surfaces of the
cubes.
That is halfway in-line with the design idea of their logo.

See PR #1610 and link
https://blog.bazel.build/2017/07/05/new-logo-and-homepage.html

[how]
Based on the idea from Ezekiel Warren the Bazel icon gets gaps between
the surfaces of the cubes.
For this we use the skeleton svg icon of the Bazel website and construct
from scratch a new outline to represent the cube surfaces. The original
svg used lines with a width to create the image, which is not compatible
to fonts.

Signed-off-by: Fini Jastrow <ulf.fini.jastrow@desy.de>

src/svgs/bazel_nf.svg

@@ -0,0 +1 @@
+<svg width="32" height="32" version="1.1" viewBox="0 0 512 512" xmlns="http://www.w3.org/2000/svg"><path d="m259.2 330.2c22.15-22.14 44.29-44.29 66.43-66.43v61.83c-22.16 22.23-44.29 44.49-66.43 66.75zm-73.57-4.599-0.01387-62.18c22.15 22.15 44.29 44.29 66.43 66.44-0.0287 20.77-0.0574 41.54-0.08562 62.3-21.92-21.99-46.41-46.57-66.34-66.56zm1.605-70.61 68.65-68.65c22.8 22.8 45.6 45.6 68.39 68.39-22.88 22.86-45.71 45.77-68.65 68.56-23.54-23.41-46.57-46.49-68.39-68.31zm-75.21-2.981v-62.35c22.2 22.2 44.4 44.4 66.61 66.61l-0.08611 62.26c-22.85-22.85-45.28-45.28-66.52-66.52zm220.8 4.599c22.26-22.26 44.52-44.52 66.77-66.77v62.17c-22.25 22.14-44.48 44.3-66.77 66.39zm-219.1-75.29 68.48-68.65 68.65 68.65-68.65 68.56zm147.2 0 68.48-68.48c22.85 22.86 45.71 45.72 68.56 68.58-22.88 22.76-45.65 45.64-68.67 68.27-23.48-23.48-46.54-46.55-68.37-68.37z" stroke-width=".1703"/></svg>

src/svgs/icons.tsv

@@ -90,7 +90,8 @@
 061		i_seti_asm				asm.svg
 062		i_seti_audio				audio.svg
 063		i_seti_babel				babel.svg
-064		i_seti_bazel				bazel.svg
+064		i_custom_bazel				bazel_nf.svg
+064		i_seti_bazel
 065		i_seti_bicep				bicep.svg
 066		i_seti_bsl				bsl.svg
 067		i_seti_cake_php				cake_php.svg