add docx starmath testing documents

It's simply a bunch of documents with various math features in them.
It'd be nice to have an automated test built on top of them that
checks the formula is the same (roughly, in the meaning, it can't be
precise because import adds e.g. extra {}'s) after an export+import
roundtrip.
diff --git a/starmath/qa/testdocuments/docx/accents.docx b/starmath/qa/testdocuments/docx/accents.docx
new file mode 100644
index 0000000..b623cb5
--- /dev/null
+++ b/starmath/qa/testdocuments/docx/accents.docx
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diff --git a/starmath/qa/testdocuments/docx/d.docx b/starmath/qa/testdocuments/docx/d.docx
new file mode 100644
index 0000000..a18afdd
--- /dev/null
+++ b/starmath/qa/testdocuments/docx/d.docx
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diff --git a/starmath/qa/testdocuments/docx/escaping.docx b/starmath/qa/testdocuments/docx/escaping.docx
new file mode 100644
index 0000000..d51c475
--- /dev/null
+++ b/starmath/qa/testdocuments/docx/escaping.docx
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diff --git a/starmath/qa/testdocuments/docx/lim.docx b/starmath/qa/testdocuments/docx/lim.docx
new file mode 100644
index 0000000..6adb548
--- /dev/null
+++ b/starmath/qa/testdocuments/docx/lim.docx
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diff --git a/starmath/qa/testdocuments/docx/malformed_xml.docx b/starmath/qa/testdocuments/docx/malformed_xml.docx
new file mode 100644
index 0000000..53d64b0
--- /dev/null
+++ b/starmath/qa/testdocuments/docx/malformed_xml.docx
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diff --git a/starmath/qa/testdocuments/docx/matrix.docx b/starmath/qa/testdocuments/docx/matrix.docx
new file mode 100644
index 0000000..d6b5b18
--- /dev/null
+++ b/starmath/qa/testdocuments/docx/matrix.docx
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diff --git a/starmath/qa/testdocuments/docx/mso2k7.docx b/starmath/qa/testdocuments/docx/mso2k7.docx
new file mode 100644
index 0000000..b6b16ef
--- /dev/null
+++ b/starmath/qa/testdocuments/docx/mso2k7.docx
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diff --git a/starmath/qa/testdocuments/docx/nary.docx b/starmath/qa/testdocuments/docx/nary.docx
new file mode 100644
index 0000000..f3bb781
--- /dev/null
+++ b/starmath/qa/testdocuments/docx/nary.docx
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diff --git a/starmath/qa/testdocuments/docx/overbrace_underbrace.docx b/starmath/qa/testdocuments/docx/overbrace_underbrace.docx
new file mode 100644
index 0000000..e4119f6
--- /dev/null
+++ b/starmath/qa/testdocuments/docx/overbrace_underbrace.docx
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diff --git a/starmath/qa/testdocuments/docx/overstrike.docx b/starmath/qa/testdocuments/docx/overstrike.docx
new file mode 100644
index 0000000..9809edc
--- /dev/null
+++ b/starmath/qa/testdocuments/docx/overstrike.docx
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diff --git a/starmath/qa/testdocuments/docx/placeholders.docx b/starmath/qa/testdocuments/docx/placeholders.docx
new file mode 100644
index 0000000..1c32c04
--- /dev/null
+++ b/starmath/qa/testdocuments/docx/placeholders.docx
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diff --git a/starmath/qa/testdocuments/docx/rad.docx b/starmath/qa/testdocuments/docx/rad.docx
new file mode 100644
index 0000000..39194dc
--- /dev/null
+++ b/starmath/qa/testdocuments/docx/rad.docx
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diff --git a/starmath/qa/testdocuments/docx/subscripts.docx b/starmath/qa/testdocuments/docx/subscripts.docx
new file mode 100644
index 0000000..038925f
--- /dev/null
+++ b/starmath/qa/testdocuments/docx/subscripts.docx
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diff --git a/starmath/qa/testdocuments/docx/vertical_stacks.docx b/starmath/qa/testdocuments/docx/vertical_stacks.docx
new file mode 100644
index 0000000..50dfab0
--- /dev/null
+++ b/starmath/qa/testdocuments/docx/vertical_stacks.docx
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