Updated release notes and splash for 5.4-rc3

rtdata/images/rt_splash.svg

@@ -517,9 +517,9 @@
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@@ -544,7 +544,7 @@
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@@ -918,7 +918,7 @@
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-           style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:17.06666598px;line-height:110.00000238%;font-family:'ITC Eras Std';-inkscape-font-specification:'ITC Eras Std Bold';text-align:end;letter-spacing:-1.06666672px;text-anchor:end;fill:#ffffff;stroke-width:1.06666672px">Release Candidate 1</tspan></text>
+           style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:17.06666565px;line-height:110.00000238%;font-family:'ITC Eras Std';-inkscape-font-specification:'ITC Eras Std Bold';text-align:end;letter-spacing:-1.06666672px;text-anchor:end;fill:#ffffff;stroke-width:1.06666672px">Release Candidate 3</tspan></text>
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